Push passes to another commands, as described in https://public-inbox.org/git/20171129032214.GB32345@xxxxxxxxxxxxxxxxxxxxx/ As it gets complicated to correctly track the data length, instead transfer the data through parent process and cut the pipe as the specified length is reached. Do it only when CONTENT_LENGTH is set, otherwise pass the input directly to the forked commands. Add tests for cases: * CONTENT_LENGTH is set, script's stdin has more data, with all combinations of variations: fetch or push, plain or compressed body, correct or truncated input. * CONTENT_LENGTH is specified to a value which does not fit into ssize_t. Helped-by: Junio C Hamano <gitster@xxxxxxxxx> Signed-off-by: Max Kirillov <max@xxxxxxxxxx> --- help.c | 1 + http-backend.c | 32 ++++- t/t5562-http-backend-content-length.sh | 155 +++++++++++++++++++++++++ t/t5562/invoke-with-content-length.pl | 37 ++++++ 4 files changed, 223 insertions(+), 2 deletions(-) create mode 100755 t/t5562-http-backend-content-length.sh create mode 100755 t/t5562/invoke-with-content-length.pl diff --git a/help.c b/help.c index dd35fcc133..e469f5731c 100644 --- a/help.c +++ b/help.c @@ -609,6 +609,7 @@ int cmd_version(int argc, const char **argv, const char *prefix) else printf("no commit associated with this build\n"); printf("sizeof-long: %d\n", (int)sizeof(long)); + printf("sizeof-size_t: %d\n", (int)sizeof(size_t)); /* NEEDSWORK: also save and output GIT-BUILD_OPTIONS? */ } return 0; diff --git a/http-backend.c b/http-backend.c index d0b6cb1b09..e88d29f62b 100644 --- a/http-backend.c +++ b/http-backend.c @@ -373,6 +373,8 @@ static void inflate_request(const char *prog_name, int out, int buffer_input, ss unsigned char in_buf[8192]; unsigned char out_buf[8192]; unsigned long cnt = 0; + int req_len_defined = req_len >= 0; + size_t req_remaining_len = req_len; memset(&stream, 0, sizeof(stream)); git_inflate_init_gzip_only(&stream); @@ -387,8 +389,15 @@ static void inflate_request(const char *prog_name, int out, int buffer_input, ss n = read_request(0, &full_request, req_len); stream.next_in = full_request; } else { - n = xread(0, in_buf, sizeof(in_buf)); + ssize_t buffer_len; + if (req_len_defined && req_remaining_len <= sizeof(in_buf)) + buffer_len = req_remaining_len; + else + buffer_len = sizeof(in_buf); + n = xread(0, in_buf, buffer_len); stream.next_in = in_buf; + if (req_len_defined && n > 0) + req_remaining_len -= n; } if (n <= 0) @@ -431,6 +440,23 @@ static void copy_request(const char *prog_name, int out, ssize_t req_len) free(buf); } +static void pipe_fixed_length(const char *prog_name, int out, size_t req_len) +{ + unsigned char buf[8192]; + size_t remaining_len = req_len; + + while (remaining_len > 0) { + size_t chunk_length = remaining_len > sizeof(buf) ? sizeof(buf) : remaining_len; + ssize_t n = xread(0, buf, chunk_length); + if (n < 0) + die_errno("Reading request failed"); + write_to_child(out, buf, n, prog_name); + remaining_len -= n; + } + + close(out); +} + static void run_service(const char **argv, int buffer_input) { const char *encoding = getenv("HTTP_CONTENT_ENCODING"); @@ -457,7 +483,7 @@ static void run_service(const char **argv, int buffer_input) "GIT_COMMITTER_EMAIL=%s@http.%s", user, host); cld.argv = argv; - if (buffer_input || gzipped_request) + if (buffer_input || gzipped_request || req_len >= 0) cld.in = -1; cld.git_cmd = 1; if (start_command(&cld)) @@ -468,6 +494,8 @@ static void run_service(const char **argv, int buffer_input) inflate_request(argv[0], cld.in, buffer_input, req_len); else if (buffer_input) copy_request(argv[0], cld.in, req_len); + else if (req_len >= 0) + pipe_fixed_length(argv[0], cld.in, req_len); else close(0); diff --git a/t/t5562-http-backend-content-length.sh b/t/t5562-http-backend-content-length.sh new file mode 100755 index 0000000000..057dcb85d6 --- /dev/null +++ b/t/t5562-http-backend-content-length.sh @@ -0,0 +1,155 @@ +#!/bin/sh + +test_description='test git-http-backend respects CONTENT_LENGTH' +. ./test-lib.sh + +test_lazy_prereq GZIP 'gzip --version' + +verify_http_result() { + # some fatal errors still produce status 200 + # so check if there is the error message + if grep 'fatal:' act.err + then + return 1 + fi + + if ! grep "Status" act.out >act + then + printf "Status: 200 OK\r\n" >act + fi + printf "Status: $1\r\n" >exp && + test_cmp exp act +} + +test_http_env() { + handler_type="$1" + request_body="$2" + shift + env \ + CONTENT_TYPE="application/x-git-$handler_type-pack-request" \ + QUERY_STRING="/repo.git/git-$handler_type-pack" \ + PATH_TRANSLATED="$PWD/.git/git-$handler_type-pack" \ + GIT_HTTP_EXPORT_ALL=TRUE \ + REQUEST_METHOD=POST \ + "$TEST_DIRECTORY"/t5562/invoke-with-content-length.pl \ + "$request_body" git http-backend >act.out 2>act.err +} + +ssize_b100dots() { + # hardcoded ((size_t) SSIZE_MAX) + 1 + case "$(build_option sizeof-size_t)" in + 8) echo 9223372036854775808;; + 4) echo 2147483648;; + *) die "Unexpected ssize_t size: $(build_option sizeof-size_t)";; + esac +} + +test_expect_success 'setup' ' + export HTTP_CONTENT_ENCODING="identity" && + git config http.receivepack true && + test_commit c0 && + test_commit c1 && + hash_head=$(git rev-parse HEAD) && + hash_prev=$(git rev-parse HEAD~1) && + printf "want %s" "$hash_head" | packetize >fetch_body && + printf 0000 >>fetch_body && + printf "have %s" "$hash_prev" | packetize >>fetch_body && + printf done | packetize >>fetch_body && + test_copy_bytes 10 <fetch_body >fetch_body.trunc && + hash_next=$(git commit-tree -p HEAD -m next HEAD^{tree}) && + printf "%s %s refs/heads/newbranch\\0report-status\\n" "$_z40" "$hash_next" | packetize >push_body && + printf 0000 >>push_body && + echo "$hash_next" | git pack-objects --stdout >>push_body && + test_copy_bytes 10 <push_body >push_body.trunc && + : >empty_body +' + +test_expect_success GZIP 'setup, compression related' ' + gzip -c fetch_body >fetch_body.gz && + test_copy_bytes 10 <fetch_body.gz >fetch_body.gz.trunc && + gzip -c push_body >push_body.gz && + test_copy_bytes 10 <push_body.gz >push_body.gz.trunc +' + +test_expect_success 'fetch plain' ' + test_http_env upload fetch_body && + verify_http_result "200 OK" +' + +test_expect_success 'fetch plain truncated' ' + test_http_env upload fetch_body.trunc && + ! verify_http_result "200 OK" +' + +test_expect_success 'fetch plain empty' ' + test_http_env upload empty_body && + ! verify_http_result "200 OK" +' + +test_expect_success GZIP 'fetch gzipped' ' + test_env HTTP_CONTENT_ENCODING="gzip" test_http_env upload fetch_body.gz && + verify_http_result "200 OK" +' + +test_expect_success GZIP 'fetch gzipped truncated' ' + test_env HTTP_CONTENT_ENCODING="gzip" test_http_env upload fetch_body.gz.trunc && + ! verify_http_result "200 OK" +' + +test_expect_success GZIP 'fetch gzipped empty' ' + test_env HTTP_CONTENT_ENCODING="gzip" test_http_env upload empty_body && + ! verify_http_result "200 OK" +' + +test_expect_success GZIP 'push plain' ' + test_when_finished "git branch -D newbranch" && + test_http_env receive push_body && + verify_http_result "200 OK" && + git rev-parse newbranch >act.head && + echo "$hash_next" >exp.head && + test_cmp act.head exp.head +' + +test_expect_success 'push plain truncated' ' + test_http_env receive push_body.trunc && + ! verify_http_result "200 OK" +' + +test_expect_success 'push plain empty' ' + test_http_env receive empty_body && + ! verify_http_result "200 OK" +' + +test_expect_success GZIP 'push gzipped' ' + test_when_finished "git branch -D newbranch" && + test_env HTTP_CONTENT_ENCODING="gzip" test_http_env receive push_body.gz && + verify_http_result "200 OK" && + git rev-parse newbranch >act.head && + echo "$hash_next" >exp.head && + test_cmp act.head exp.head +' + +test_expect_success GZIP 'push gzipped truncated' ' + test_env HTTP_CONTENT_ENCODING="gzip" test_http_env receive push_body.gz.trunc && + ! verify_http_result "200 OK" +' + +test_expect_success GZIP 'push gzipped empty' ' + test_env HTTP_CONTENT_ENCODING="gzip" test_http_env receive empty_body && + ! verify_http_result "200 OK" +' + +test_expect_success 'CONTENT_LENGTH overflow ssite_t' ' + NOT_FIT_IN_SSIZE=$(ssize_b100dots) && + env \ + CONTENT_TYPE=application/x-git-upload-pack-request \ + QUERY_STRING=/repo.git/git-upload-pack \ + PATH_TRANSLATED="$PWD"/.git/git-upload-pack \ + GIT_HTTP_EXPORT_ALL=TRUE \ + REQUEST_METHOD=POST \ + CONTENT_LENGTH="$NOT_FIT_IN_SSIZE" \ + git http-backend </dev/zero >/dev/null 2>err && + grep "fatal:.*CONTENT_LENGTH" err +' + +test_done diff --git a/t/t5562/invoke-with-content-length.pl b/t/t5562/invoke-with-content-length.pl new file mode 100755 index 0000000000..6c2aae7692 --- /dev/null +++ b/t/t5562/invoke-with-content-length.pl @@ -0,0 +1,37 @@ +#!/usr/bin/perl +use 5.008; +use strict; +use warnings; + +my $body_filename = $ARGV[0]; +my @command = @ARGV[1 .. $#ARGV]; + +# read data +my $body_size = -s $body_filename; +$ENV{"CONTENT_LENGTH"} = $body_size; +open(my $body_fh, "<", $body_filename) or die "Cannot open $body_filename: $!"; +my $body_data; +defined read($body_fh, $body_data, $body_size) or die "Cannot read $body_filename: $!"; +close($body_fh); + +my $exited = 0; +$SIG{"CHLD"} = sub { + $exited = 1; +}; + +# write data +my $pid = open(my $out, "|-", @command); +{ + # disable buffering at $out + my $old_selected = select; + select $out; + $| = 1; + select $old_selected; +} +print $out $body_data or die "Cannot write data: $!"; + +sleep 60; # is interrupted by SIGCHLD +if (!$exited) { + close($out); + die "Command did not exit after reading whole body"; +} -- 2.17.0.1185.g782057d875
